Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add mikeholownych/unifi-mcp --skill unifi-mdns-discoverygit clone --depth 1 https://github.com/mikeholownych/unifi-mcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/mikeholownych/unifi-mcp/unifi-mdns-discovery)<a href="https://agentmods.dev/skills/mikeholownych/unifi-mcp/unifi-mdns-discovery"><img src="https://agentmods.dev/badge/skills/mikeholownych/unifi-mcp/unifi-mdns-discovery/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/mikeholownych/unifi-mcp/unifi-mdns-discovery"><img src="https://agentmods.dev/badge/skills/mikeholownych/unifi-mcp/unifi-mdns-discovery.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00084 | $0.00811 |
| Opus 5 | $0.00042 | $0.00405 |
| Sonnet 5 | $0.00017 | $0.00162 |
| Haiku 4.5 | $0.00008 | $0.00081 |
Grade A, and why
unifi-mdns-discovery scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 61 lines — stays where its author put it; the contents beside it link to each section on GitHub.
UniFi mDNS / Cross-VLAN Discovery
Fix "device works but apps can't find it" — the classic symptom of services that advertise via mDNS (Bonjour/Avataar/Cast/Spotify-Connect) being separated from their clients by VLANs or firewall zones.
Mental model
- Discovery = link-local multicast to
224.0.0.251:5353. Routers do not forward multicast between subnets by design. - After the advert is discovered, the actual session is normal unicast — so the fix must carry the ADVERTISEMENTS across, and zone-firewall rules must allow the unicast session both ways (or rely on return traffic).
Step 0 & triage ladder
get_sysinfo (version facts are 10.x). Then:
- Same subnet first — put the phone ONTO THE SAME SSID as the device and retry. If it works there, it's a cross-VLAN problem → continue. This solves ~half of all cases instantly.
- Confirm both endpoints' networks:
get_client_detailsfor each (which SSID/network/VLAN). Watch for: phone on guest network, IoT on an IoT VLAN, client-isolation enabled on a guest WLAN (get_wlans: is_guest / l2_isolation) which blocks peer-to-peer even locally. - Check WLAN multicast enhancement:
get_wlanssummary + underlying config —mcastenhance_enabled:truecan suppress bonjour on that SSID. Disable per-SSID if discovery dies only on WiFi, not wired. - Zone-firewall path (
get_firewall_policies): look for existingAllow mDNSpolicies (udp) between the two zones. UniFi's mDNS repeater/ proxy typically handles reflection once permitted; if absent, plan:- ALLOW udp 5353 src= dst= (+ return), OR
- enable controller mDNS proxy rather than raw firewall holes when available.
- IPTV caution: if the site has ISP IPTV multicast (look for "Allow IPTV Streaming" predefined policies / BELL-TV style zones), do NOT enable broad IGMP flooding/snooping changes globally — you can break live TV. Scope changes narrowly.
Common resolutions mapped to causes
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 61 lines · 0 tokens per session scan A d3d21183f6e3
unifi-mdns-discovery is a skill published in the GitHub repository mikeholownych/unifi-mcp (0 stars, last pushed 12d ago), licensed MIT. It adds 84 tokens to every session and 811 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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